During the live shopping trip use chat on the Periscope app to point out which item you are interested in, and where (location, e.g., country or state) it will be shipped to.

A link for continuing the purchase will be shared with you. That will show the purchase price, shipping cost, and terms. You'll also see the Bitcoin address to send payment to for making payment. After payment is made, the eposide host will make the purchase on your behalf and ship your item to you.

You can access OpenBazaar using a mobile app ( BazaarHound ) or view the FirstPersonShopper OpenBazaar store using https://duosear.ch/@FirstPersonShopper. See the episode's announcement post here on this subreddit to get the link to the keywords for that episode.